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BALANCE SHEET INFORMATION - Schedule of Service Parts Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
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Balance Sheet Related Disclosures [Abstract] |  |
Finished goods | $ 476 | $ 1,189
Component parts | 462 | 909
Total service parts inventories | $ 938 | $ 2,098

X
- Definition Carrying amount as of the balance sheet date of service parts inventories. + References No definition available. + Details
Name: | qtm_ServicePartsInventories
Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of component parts to be used in service parts that will be consumed. + References No definition available. + Details
Name: | qtm_ServicePartsInventoriesComponentParts
Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of completed service parts merchandise or goods expected to be sold within one year or operating cycle, if longer. + References No definition available. + Details
Name: | qtm_ServicePartsInventoriesFinishedGoods
Namespace Prefix: | qtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration